My wifes car (190E) has started to 'surge' when coming to a stop and while still in gear(automatic). The revs increase slightly ( as if accelaerating) for a second or so and then return to normal idle and this is repeated until take off again. This does not happen if shifted into park mode.?? Any suggestions please.

I would suspect a worn airflow meter potentiomenter. Airflow demand will be higher in drive, and the pot will be wiping a different part of the element than in park or neutral. This spot it's likely worn thru.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7

Thank you for your comments....I have never heard about or come across this part you mention. Is it something a novice could replace or a shop R&R ?

Do a search here for 'airflow meter potentiometer' or 'airflow meter pot'. Lots of pics and info. The part is not separately available from Mercedes, but as a Bosch part from various part houses.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7

Thanks again.....will check it out.

If its the part I'm thinking of its an oblong black box on the front of the airflow sensor/throtle body, its got a plug running from the front. I've read that the sensor can be cleaned if very careful.

Mike.

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http://img4.photobucket.com/albums/0...nd_sig_pic.jpg

1990 Euro 190e 2.0l Petrol Now Sold Maybe a w116 280se next

Be sure to start with basics for replacing expensive parts: air/fuel ratio, timing, plugs/rotor etc.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)